Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John Waldner0
Date of Patent
September 21, 2010
Patent Application Number
11727313
Date Filed
March 26, 2007
Patent Primary Examiner
Patent abstract
A ventilation chimney or exhaust fan flue section for hog barns has inner and outer plastic tubes formed by edge welding plastic sheets. A snug fitting insulation sheet is slid between the tubes. Collars of male and female coupling elements are inserted into the ends of the section between the inner and outer tubes and secured by screws passing through the outer tube and into the collars. The chimney can be installed by combining sections using a suitable adhesive.
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